The new cover for the holding tank is on, and the gauge has been fitted..

Woodstain and varnish have failed to match the color to the bulkhead. 

The sensor has been fitted, and wired up to the gauge, and calibrated. Very straightforward, and users of the heads can now check before flushing.

I had a slight mishap, tearing one of the copper foil sensors, but the company sent me a replacement very promptly – allowing me to pay after it arrived.

The next task is to hide the vertical pipes and build a storage unit for charts, manuals and papers, in the driest part of the boat.